Prime mover starting and shutdown system



Nov. 3, 1953 c. A. BRANCKE PRIME MOVER STARTING AND SHUTDOWN SYSTEM Filed June 21, 1952 Patented Nov. 3, 1953 PRIME MOVER STARTING AND SHUTDOWN SYSTEM Carl A. Brancke, North East, Pa., assignor to General Electric Company, a. corporation of New York Application June 21, 1952, Serial No. 294,808

25 Claims. 1

This invention relates to a system for starting up and shutting down a thermal prime mover, for example, a gas turbine, and has particular application in connection with such a prime mover used on a self-propelled vehicle.

In conventional diesel-electric locomotives, the diesel prime mover is started by either injecting compressed air into the cylinders or cranking the diesel by means of a cranking motor energized by batteries in a manner similar to the starting of an automotive gasoline engine. A gas turbine, however, must be cranked to a much higher speed than a diesel in order to become self-sustaining, i. e. until the energy developed by the turbine is sufiicient to operate the compressor. The cranking of gas turbines utilized in central station applications presents no problem since there is adequate commercial power available to crank the turbine with a cranking motor. In the gas turbine-electric locomotive, however, space and weight limitations prohibit providing sufficient battery capacity for directly cranking the turbine and it is also not feasible to crank it with compressed air. It is, therefore, necessary in the design of gas turbine-electric locomotives to provide auxiliary means for cranking the gas turbine. Since the gas turbine in a gas turbine-electric locomotive drives one or more direct current traction generators, it has been found feasible to energize one of these traction generators as a motor for cranking the turbine and this energization may be provided by an auxiliary thermal prime mover, such as a small diesel engine driving an auxiliary generator.

In order to start the gas turbine utilizing a separate auxiliary diesel-driven generator to energize one of the turbine-driven traction generators as a motor to crank the turbine, it has been found desirable to first crank the turbine to firing speed, then inject the fuel, and finally to disconnect the diesel-driven auxiliary generator from the traction generator when the turbine reaches idling speed. In order to provide continuous battery charging without the necessity for operating the auxiliary diesel after cranking is completed, a second auxiliary generator is provided mechanically driven by the gas turbine and it is, therefore, necessary to transfer battery charging from the diesel generator to the auxiliary generator and to shut down the diesel when the turbine has successfully reached idling speed. It has further been found desirable initially to inject a high grade fuel, such as diesel fuel into the turbine for starting and after the turbine has reached idling speed, to transfer to a lower grade fuel, such as Bunker C fuel oil. While the starting equipment for a Central Station gas turbine may be reasonably complicated, in the case of the gas turbine-electric locomotive, it is necessary to provide simplified supervisory control means for initiating the various steps in the starting and shutdown sequence, and further, it is desirable that the engineman be restrained from advancing the control to the next position unless the required operating conditions have been met in the present control position.

An object of this invention is, therefore, to provide an improved starting and shutdown system for a thermal prime mover wherein the above enumerated features are incorporated.

Further objects and advantages of this inven tion will become apparent and the invention will be better understood by reference to the following description and the accompanying drawing and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and form ing a part of this specification.

In accordance with this invention, there is provided a thermal prime mover, such as a gas turbine mechanically connected to drive a main generator, such as one of the traction generators of a gas turbine-electric locomotive, and an auxiliary generator. An auxiliary thermal power prime mover, such as a diesel is also provided mechanically connected to drive another auxiliary generator. In order to start the main prime mover, the auxiliary prime mover is first started in any conventional manner, as for example by a cranking motor energized from the locomotive batteries. Circuit establishing means are provided for connecting the auxiliary prime mover driven generator to the main generator in order to operate it as a motor to crank the turbine. Two sources of fuel are provided, such as diesel fuel and Bunker C fuel with valves respectively arranged to inject the two types of fuel into the prime mover. Supervisory control means, such as a drum controller, is provided arranged to sequentially connect the auxiliary prime mover-driven generator to the main generator, to actuate the first fuel valve to admit the first type of fuel to the main prime mover, and to actuate the second fuel valve to admit the second type of fuel to the main prime mover. In order to prevent the engineman from advancing the controller to successively higher positions before the required operating conditions have been filled, means responsive to the speed of the auxiliary prime mover are provided to prevent advancing the controller to the position to actuate the circuit establishing means unless the auxiliary prime mover is operating at a predetermined speed. Further, means responsive to the turbine speed are provided to prevent the engineman from advancing the controller to the position in which the first fuel valve is actuated unless the main prime mover is being cranked at a first predetermined speed. Since it is not desirable to inject the low grade fuel into the turbine unless it is operating at idling speed, a third means responsive to the speed of the main prime mover is provided -preventing operation of the controller to the position in which the second fuel valve is actuated unless the turbine has reached idling speed and this speed responsive means also disccnnects the auxiliary prime mover-driven genorator from the main generator when idling speed is reached. With the main prime mover idling on the low grade fuel, .the controller then be advanced to transfer battery charging from the auxiliary prime mover-driven generator to the main prime mover-driven auxiliary generator and subsequently to stop the auxiliary prime mover.

In order to shutdown the main prime mover, the engineman .rnoves the supervisory control means back from the last position to actuate the auxiliary prime mover starting means and transfer battery charging from the main prime mover-driven auxiliary generator to the auxiliary prime mover-driven generator. Moving the supervisory control means bacl: another step shuts off the low grade fuel from :the main prime mover and again injects the high grade fuel. Moving the controller again another step shuts off all fuel from the main prime moverand permits it to coast until a low predetermined speed is reached at which one of the speed responsive means reconnects the auxiliary prime moverdriven generator to the .main generator to crank the main prime mover for cool-down. After a sufiicient period of cool-down cranking, moving the controller again disconnects the auxiliary prime mover-driven generator from the main generator to stop the cool-down cranking .and

reconnects the auxiliary prime mover-driven generator to the battery for charging. Moving the controller to the off position stops the auxiliary-prime mover.

The single figure of the drawing schematically illustrates the improved thermal prime mover 1 starting and shutdown system of this invention.

Referring now to the drawing, there is shown a main thermal prime mover, such as a locomotive gas turbine l mechanically connected to drive at least one main traction generator 2 and an auxiliary generator 3. An auxiliary thermal prime mover, such as a diesel 4, is provided mechanically connected to drive another auxiliary generator 5. The excitation systems for generators 2, 3 and 5 form no part of this invention and are not shown. The control power for the system is provided by battery 6 connected respectively to positive line 1 and negative line 8. The main generator 2, turbine driven auxiliary generator 3, and diesel driven auxiliary generator 5 are respectively connected to negative control line 8 by lines 9, I and l I with main generator 2 having its other line I2 connected to a bus [3. The other side M of diesel-driven generator is connected to bus [3 through normally open contacts 15 of relay I6 and is also connected to control line '1 through lines l1 and normally open contacts I8 of diesel battery charging relay [9. It will thus be readily seen that when the contacts l5 of relay l6 are closed, the diesel-driven generator 5 and the main generator 2 are connected in a loop circuit so that the main generator 2 is being operated as a motor to crank the turbine I. It will also be readily seen that when the contact l8 of relay I9 is closed, the diesel driven generator 5 is connected across the control lines 1 and B for charging the battery 5. The other side 20 of turbine driven auxiliary generator 3 is also connected to the control line I through line H and normally open contacts 2i of auxiliary battery charging relay 22.

Operating coil "23 of relay I6 is connected between control line B and contacts 24 of controller 25 with normally closed contacts 26 of turbine driven speed responsive switch being interposed in series therewith. Operating coil 21 of diesel battery charging relay l9 has one side connected to control line 8 and its other side connected to contacts 28 of controller 25 through normally closed contacts 29 of relay l6. Operating coil 21 of diesel battery charging relay I9 is also connected to the other control line I through normally open contacts 30 of cool-down relay 3|. Operating coil 32 of auxiliary battery charging relay 22 is connected between control line sand contacts 33 of controller 25. It will be readily seen that when contacts 2| of auxiliary battery charging relay 22 are closed, the turbine driven auxiliary generator -3 will be connected across control lines 'I and 3 for charging battery :6 and that when contacts as of cool-down relay 3] are closed, the operating coil 2T of diesel battery charging relay [9 is directly connected across control lines 1 and 8 shorting out contact 29 of relay [6 and contact 28 of controller 25.

The diesel 4 is provided with any conventional starting arrangement, shown here schematically at 34, such as a conventional starting motor which might be energized from battery 5. The starting means '34 is in turn actuated in any conventional manner by a diesel operating relay 35 having its operating coil 36 connected to control line 8 and contacts 31 of controller '25. For manually starting diesel 4, operating coil 36 of diesel operating relay 35is also connected to control line I through manual starting switch '38. It will be readily understood that when the operating coil 36 of diesel operating relay 35 is energized, the starting means 34 will start the diesel 4 and it will operate as long as operating coil 36 is energized. When operating coil 36 'is de-energized, however, the diesel 4 wlllstop.

Two fuel tanks 39 and respectively are schematically shown, tank supplying diesel fuel .to diesel t through fuel line ll and to the turbine I through fuel line The fuel tank sup plies low grade fuel to the turbine i, for exam ple, Bunker C fuel oil, through fuel line 43. A solenoid'actuated valve 44 is providedinithe'line 32 with its operating coil 45 connected between control line 8 and contacts of controller 25. Solenoid actuated valve ll is provided .in fuel line 3 with its operating coil -48 connected be tween control line 8 and contacts 4%) of -con troller 2.5. t will now be readily seen that with contacts 3i of controller 253 closed, the "diesel operating relay will be energized starting-diesel l. With contacts 23 of controller energized, and before relay 15 is energized, contacts 29 cesarea- 5,. thereof will be closed energizing diesel battery charging relay 9 to place diesel generator 5 across lines '3 and 8 to charge battery 5. When contacts 24 of controller 25 are closed, relay 15 will be energized closing contacts l5 placing diesel generator 5 in a loop circuit with main generator 5 to crank turbine I and opening contacts 25 to de-energize diesel battery charging relay Iii to disconnect diesel generator 5 from its battery charging connection. When contacts 36 of controller are closed, diesel fuel operating coil 45 will be energized operating valve 44 to admit diesel fuel to the gas turbine l and when the turbine reaches a predetermined speed, speed responsive switch 25 will open de-energizing relay l6, opening contact 55 and closing contact 29. Thus, the diesel generator 5 is disconnected from the main generator 2 and diesel battery charging relay I9 is again energized closing contacts iii to place diesel generator 5 across lines 7 and 8 to charge battery 5. When contacts 59 of controller are closed, Bunker fuel operatin coil 85 is energized opening valve =37 to admit Bunker 0 fuel to the gas turbine I.

In order to insure that the controller 25 is not moved to successive positions until the required operating characteristics are obtained in the previous position, latching device 59 is provided having coils i and 52. With this arrangement, controller 25 cannot be moved from position 1 to position 2 unless coil 5| is energized, from position 2 to 3 unless coil 52 is energized, from position 3 to position i unless coil 5! is again energized, and from position 4 to 5 unless coil is again energized. Such latching arrangements are commercially available and therefore no further description of the latch 5% will be given here. Th side 53 of the latch coil 5| is connected to control line 8 while the side 54 is connected to contacts 55, 56 and 5! of controller 25. The side 58 of latch coil 52 is also connected to the control line 8 and the other side 59 is connected to contacts 6t, 6! and 62 of controller The other side of the contact 55 is connected to the other control line 1 through normally open contacts of a diesel-driven speed responsive switch The other sides of contacts 56 and iii are respectively connected to control line 3 through pilot light ri l. The other side of contact 5? is connected to the other control line 'I' through normally closed contacts 85 of relay [5. The other side of the contact 62 is connected to the other control line '5 through normally open contacts as on Bunker C fuel valve 48.

The operating coil 5! of cool-down relay 3| is connected between control line 8 and contacts 68 of controller through the normally open contacts of turbine driven speed responsive switch cs. The other side of contact to of controller 25 is connected to the other control line 1 through a normally open contact of turbine driven speed responsive switch iii. One traction motor El is shown schematically connected between line 8 and bus Il through normally open contacts 12 of power contactor E3. The operating coil 14 of power contactor it is connected between line 8 and contacts '55 of controller 25. The other sides of contacts Ell, 24, 33, 49, 75 and 58 of controller 25 are respectively connected to control line i.

The controller 25 may be of the conventional type in which a plurality of cam surfaces actuates the contacts, shown here as having five positions in addition to an off position. In the cam development shown, none of the contacts were closed in the oil position while contacts 55, 58, 31 and 28 are closed in position 1, contacts Bi], 6 l, 31, 24 and it are closed in position 2, contacts 56, 51, 31, 28, 24 and 45 are closed in position 3, contacts El, 62, 31, 33 and -59 are closed in position 4, and contacts 33, 43 and 15 are closed in position 5.

In operation, the system functions in the following manner. With the entire system shut down, it is first necessary to start the diesel 4. To do this, the engineman advances the controller 25 from the off position to the first position in which contact 3? are closed energizing diesel operating relay 35 to operate starting device 34. In the alternative, the diesel 4 may have been manually started by closing the switch 38, as for example for battery charging alone. Contacts 25 are also closed in the first position and since relay [6 is not energized so that its contact 29 is closed, diesel battery charging relay [9 is energized closing its contact is placing the diesel generator 5 across the battery 5 for charging. When the diesel comes up to a predetermined speed, the diesel speed switch 53 will close and since contacts 55 and 5c are closed in the first position of controller 25, latch coil 5! is energized releasing the latch 56 on the controller 25 and pilot light 55 is lighted. Releasing the latch 55 permits the engineman to move controller 25 to the second position. It will now be seen that if the diesel l fails to start or to come up to the desired speed, the controller cannot be further operated to call for cranking the turbine.

When the engineman moves controller 25 to the second position, contacts 55 and 55 are opened de-energizing the latch 5i and extinguishing the pilot light 64. Contacts 37 are still closed in the second position so that the diesel operating relay 35 is still energized and the diesel l still running. In this position, contacts 28 are opened, therefore (tie-energizing diesel battery charging relay l9 opening its contact ill to remove the diesel generator 5 from the battery d. Contacts 24 are closed in the second position and since the turbine speed switch 26 is closed relay i5 is energized closing contact [5 to connect diesel generator 5 to the main generator 2 to operate the generator as a motor for cranking the turbine i. As will be hereinafter described, the turbine speed switch 26 will open at a predetermined upper speed, for example 70% of full speed, and drop out at a much lower speed, for example, 5% of full speed. With the system thus far described, the turbine I is being cranked by the diesel generator 5 energizing the main generator 2 as a motor, however, fuel has not yet been introduced. Turbine speed switch 10 is set to pick up, i. e. close at a predetermined low speed, for example 10% of full speed and to drop out at a still lower speed, for example 5% of full speed. Therefore, when the turbine cranking reaches 10% of full speed, turbine speed switch 75 will close and since contacts 60 and (il of controller 25 are closed in the second position, latch coil 52 will be energized releasing the latch 50 to permit the controller to be moved to the third position and the pilot light 64 will again be lighted.

In the third position of controller 25, contacts 31 are still closed so the diesel operating relay 35 is still energized and the diesel 4 is still running. At the time of entering the third position, the turbine speed has not yet reached the pickup point of the turbine speed switch 26 so that switch will still be closed and since contacts 24 are closed, relay 16 is still energized connecting the diesel generator to the main generator ,2 through contact [5 for cranking the turbine Contacts 453 .of controller 25 are closed in the third position energizing operating coil 45 of diesel fuel valve 44 to inject diesel fuel in the turbine I. When the predetermined pick-up setting of turbine speed switch 26 is reached, for example, 70% of full speed, this switch opens tie-energizing relay Hi opening contact and closing contact 29 thus disconnecting the diesel generator 5 from main generator 2 to cease cranking and energizing diesel battery charging'relay I 9 closing contact l8 and placing the diesel generator 5 :across the battery 5 charging. Dropping out of the relay iii closes contact and since contacts 51 and 56 of controller are closed in the third position, latch coil 5| is again energized releasing latch 58 to permit controller 25 to be moved to the fourth position and the pilot light 84 is again illuminated.

When the enginernan moves the controller 25 to the fourth position, contacts 31 are still closed energizing the diesel operating relay so that the diesel 4 is still running. Contacts 28 of the controller have opened in the fourth position so that diesel battery charging relay i9 is deenergized opening contact Iii to disconnect the diesel generator 5 from the battery 6. Contacts 33 of controller 25 have closed, however, in the fourth position thus energizing auxiliary battery charging relay 22 closing contacts 2! placing auxiliary generator 3 across the battery 6 for charging and thus effecting transfer of battery charging from diesel generatorfi to auxiliary gen-- erator 3. Contacts id of controller 25 are now open in the fourth position die-energizing :diesel fuel valve operating coil to close valve M thus shutting off diesel fuel from the turbine I. However, contacts have closed thus energizing Bunker C fuel valve operating coil 43 opening fuel valve i"! to admit Bunker C fuel to the turbine l. The energization of Bunker C fuel valve operating coil it closes contacts 66 and since contacts E2 and 5! of controller 25 are closed in the fourth position, latch coil 52 will be energized releasing latch to permit controller 25 to be moved to the fifth position and the pilot light -64 will again be energized.

In the fifth position, contacts 31 are nolonger closed thus de-energizing diesel operating relay 35 to shut down the diesel '5. Contacts 49 are closed in the fifth position thus energizing Bunker 0 fuel valve operating coil 48 causing Bunker C to supplied to the turbine and contacts 33 are closed energizing auxiliary battery charging relay 22 closing contacts '21 so that the auxiliary turbine driven generator 3 continues to charge the battery ti. In this position, contacts 15 close energizing relay it closing contacts 12 to permit the enginernan to enter motoring.

To sumo so the starting sequence described above, the 581 i is first started andconnected to battery for charging. If the diesel starts and comes up to a predetermined speed, the diesel speed switch iifi closes energizing the latch to permit the controller to be moved to the second position. In the second position, the .diesel generator is connected to the turbine generator for cranking and the turbine can be cranked up to predetermined speed, for example 10%, turbine speed switch "l8 will close energizing the latch to permit the controller 25 .to be moved .to the third position. In the third position, diesel fuel is injected into the turbine and if the turbine accelerates to a higher predetermined speed, for

r ing the battery.

example 70% of full speed, the turbine speed switch it will open disconnecting the diesel generator from the main generator and reconnecting the diesel generator for battery charging. Opening of the turbine speed switch 26 at the predetermined speed also effects energization of the latch permitting the controller to be moved to the fourth position in which battery charging is transferred from the diesel generator to the auxiliary generator and the turbine fuel is transferred from diesel type to Bunker C. After these transfers, the latch again perm-its movement of the controller to the fifth position in which the diesel is shut down and the operator is permitted to enter the motoring connections. It will thus be readily seen that unless the diesel starts, the engineman cannot advance to .the second position, unless the turbine is cranked up to 10% speed, the engineman cannot enter the third position; unless the turbine reaches 70% speed, the engineman cannot enter the fourth position, and the fifth position cannot be entered until the turbine is running on Bunker C fuel.

To shut down the turbine, the engineman moves the controller 25 from the fifth position to the fourth position thus opening contacts 15 de-energizing relay to disconnect the motor .II from the generator :2. Contacts 49 are still closed in the fourth position thus Bunker C fuel valve operating :coil ii? is still energized and Bunker .C is still supplied to the turbine. Contacts 33 are still closed and thus auxiliary battery charging relay is still energized and contacts 28 are still closed the generator 3 is still chargfowever, contactstfl close energizing diesel operating coil 35 to start the diesel 4. It should be here noted that the latch lit only functions during the starting sequence and does not prohibit movement of the controller 25 toward the off position.

Moving the controller 25 to the third position opens contacts 59 tie-energizing Bunker C fuel valve operating coil 53 to close valve ll and shutting off a supply of Bunker C fuel from the turbine l. Contacts 16 are closed in the third positienenergizing diesel fuel valve operating coil to open valve M and again admit diesel fuel to the turbine I. Contacts 33 are now open deenergizing auxiliary battery charging relay 22 opening contacts 2! to disconnect the auxiliary generator 3 from the battery 6. Contacts 24 are closed in the third position, however, the turbine l is still running at high speed on diesel fuel so the turbine speed switch 28 is still'open and thus relay is not energized. The turbine speed switch 26,, as noted hereinbefore, is preferably set to pick up, i. e. open at a predetermined high speed, for example, 70% of full speed, and drop out, i. e. close at a predetermined low speed, for example 5% of fullspeed. Since relay operating coil if; is not energized, its contact 29 is closed and sincecontacts '28 of controller 25 are closed in the third .position,.diesel battery charging relay Itv will be energized closing its contact ill to place diesel generator 5 across battery 6, thus completing .the transfer of battery charging from the auxiliary/generator 3 to the diesel generator 5.

Moving the controller 25 baclr. to the second position opens contacts l? de-energizing diesel fuel valve operating coil 45 to close valve it thus shutting off diesel fuel from the turbine .1 and initiating deceleration. It will be here noted that in the second position, contacts 28 are open and therefore diesel battery charging relay I9 will normally .be (lo-energizeddisconnecting the diesel generator from the battery 6. However, in the shutting down sequence, the turbine is at this point still operating at a speed substantially above the 5% dropout speed of turbine speed switch 26 and thus since it is unnecessary to connect the diesel generator 5 to the main generator 2 for cool-down cranking, it is desirable that the generator be connected to the battery 6 charging. To effect this connection, contacts 53 are closed in the second position. Turbine speed switch 6i is preferably arranged to pick up at a speed intermediate the pickup speeds of switches 25 and it, for example, 15% of full speed and to drop out at a very low speed, for example 1% of full speed. Thus, when the second position is entered, the turbine will be operating well above the drop-cut speed of turbine speed switch 69 and thus the switch will be closed energizing cooldown relay 3i closing contact 3b to energize diesel battery charging relay :9 through its contact is and thus connect the diesel generator 5 to the battery 6 for charging. When the turbine speed drops to the drop-out point of turbine speed switch 26, it may be desirable to initiate cool-down cranking to prevent warping of the turbine shaft, and closing of the switch 26 energizes relay is through contacts 24 of controller 25 to close contact In and thus connect diesel generator 5 to the main generator 2 for cranking.

Moving the controller 25 to the first position opens contacts 24 thus de-energizing the relay l6 and opening the contacts I5 to disconnect the diesel generator 5 from the main generator 2 to stop the cool-down cranking, the accompanying closing of contacts 29 energizing diesel battery charging relay l9 to close contact l8 and connect the diesel generator 5 across the battery 6 for charging. The contacts 68 are open in the first position thus dropping out cool-down relay 3! and since contacts 28 of controller 25 are now closed, diesel battery charging relay [9 will be energized through contacts 29 placing diesel generator 5 across the battery 6 for charging. It will be noted that contacts 3! have been closed from the fourth to the first position energizing diesel operating relay 35 so that the diesel 4 is still operating and charging the battery. Moving the controller 25 to the off position opens all of the contacts thus tie-energizing diesel battery charging relay !9 disconnecting the diesel generator 5 from the battery 6 and dc-energizing diesel operating relay 35 and stopping the diesel 4.

To summarize the shutdown sequence described hereinabove, the traction motors are first disconnected from the generator and the diesel is started. Fuel is next transferred from Bunker C to diesel type and battery charging is transferred from the auxiliary generator to the diesel generator. Diesel fuel is next shut off initiat ing the deceleration of the turbine and when the turbine speed drops to the drop-out setting of turbine speed switch 26, i. e. 5%, the turbine generator 2 is again connected to the diesel generator 5 to provide cool-down cranking of the turcine. After a sufficient period of cool-down cranking, the diesel generator is then disconnected from the turbine generator and the diesel generator continues to run charging the battery. Lastly, the diesel is shut down completing the shut down sequence.

It will now be readily apparent that this improved starting and shutdown system is characterized by its simplicity, only one supervisory control device being utilized to initiate all of the sequential operations of starting and Shu down, an essential feature when the gas turbine is utilized in a locomotive. Further, the system provides safety features which prevent the operator from attempting to advance the controller to the next position unless the requisite operating conditions have been filled in the previous position. Furthermore, the system provides for cool-down cranking in the shut down sequence. While a manually operated controller 25 has been shown, it will be readily understood that a pilot motor-driven controller may be energized through lines 5:; and 59 replacing the latch coils 5i and 52 to provide the step-by-step operation. Further, the turbine speed switches 26, 69 and lb have been shown most schematically, it being readily apparent that any device responsive to the speed of the turbine may be utilized to operate these switches, for example, centrifugal mechanisms, tachometer generators, or current responsive devices. Furthermore, while controller 25 is shown as having five positions, a larger or smaller number of positions may be utilized. For example, positions two and three may be combined to simplify the operating sequence.

While I have illustrated and described a particular embodiment of this invention, further modifications and improvements will occur to those skilled in the art. I desire it to be understood, therefore, that this invention is not limited to the specific form shown and I intend in the appended claims to cover all modifications which do not depart from the spirit and. scope of this invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

l. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of fuel for said main prime mover, means for starting said auxiliary prime mover, first circuit establishing means arranged electrically to connect said auxiliary generator to said main generator for operating the same as a motorto crank said main prime mover, valve means arranged to connect said main prime mover to said source of fuel, speed responsive circuit establishing means arranged to disconnect said auxiliary generator from said main generator responsive to a predetermined speed of said main prime mover, and supervisory control means arranged sequentially to actuate said first circuit establishing and valve means for starting said main prime mover and to deactuate said lastenumerated means in reverse sequence for shutting down said main prime mover.

2. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of fuel for said main prime mover, means for starting said auxiliary prime mover, first circuit establishing means arranged electrically to connect said auxiliary generator to said main generator for operating the same as a motor to crank. said main prime mover, first speed responsive circuit establishing means connected to render ineffective said first circuit establishing means when said auxiliary prime mover is operating below a predetermined speed, valve means arranged to connect said source of fuel to said main prime mover, second speed responsive circuit establishing means connected to render ineffective said valve means when said main prime mover is being cranked below a first predeter mined and third speed responsive circuit establishing means arranged to disconnect said auxiliary generator from said main generator resp-onsive to a second predetermined main prime mover speed.

3. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of a first type fuel for said main prime mover, a source of second type fuel for said main prime mover, means for starting said auxiliary prime mover, first circuit establishing means arranged electrically to connect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, first valve means arranged to connect said sourceof said first type of fuel to said main prime mover, spec-d responsive circuit establishing means arranged to disconnect said auxiliary generator from said main generator responsive to a predetermined speed of said main prime mover, second valve means arranged to connect said source of said second type of fuel to said main prime mover, and supervisory control means arranged sequentially to actuate said first circuit establishing and first and second valve means for starting said main prime mover" and to deactuate said lastenumerated means in reverse sequence for shutting down said main prime mover.

4. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of a first type fuel for said main prime mover, a source of second type fuel for said main prime mover, means for starting said auxiliary prime mover, first circuit establishing means arranged electrically to connect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, first speed responsive circuit establishing means connected to render inefiective said first circuit establishing means when said auxiliary prime mover is operating below a predetermined speed, first valve means arranged to connect said source of said first type offuel to said main prime mover; second speed responsive circuit establishing means connected to render ineffective said. first valve means when said main prime mover is cranked below a first predetermined speed, third speed responsive circuit establishing means arranged to disconnect said auxiliary generator from said: main generator responsive to a second predetermined speed of said main prime mover, and second valve; means arranged to connect: said source or said. second type. of fuel. to said. main prime mover, said third speed responsive circuit establishing means being connected to. render ineffective, said second valve means below said second predetermined speed; of said main prime mover.

5.. A. system. for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover me chanically connected to drive an auxiliary generator, a source of fuel for said main prime mover, a battery, means for starting said auxiliary prime mover, first circuit establish n means arranged when actuated to" electrically connect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover and when deactuated to. con nect said auxiliary generator to said battery for charging, valve means arranged to connect said source of fuel to said main. prime mover, speed responsive circuit establishing means arranged to deactuate said first circuit establishing means to disconnect said auxiliary generator from said main generator and to reconnect said auxiliary generator to. said battery: responsive to. a. prc determined speed of said main'prime mover; and supervisory control. means arranged sequentially to actuate said first circuit. establishing and valve means for starting said main. prime mover and to deaotuate said lasteenumerated meansin reverse sequence for shutting down said main prime mover.

6'. A. system for starting and shutting down a main thermal prime mover: having a main generator mechanically connected thereto comprising a first auxiliary generator mechanically connected; to. said main prime mover, an auxiliary thermal prime mover mechanically con-- nected to drive a second auxiliary generator, a battery, a source of fuel for said main prime mover, operating means arranged when-actuated to start and run said auxiliary prime mover and when deactuated to stop the same, first circuit establishing means arranged when actuated to electrical-1y; connect said second auxiliary generator to said, main. generator for operating the sameas a motor'to crank said main primemover and when deactuated to connect said second auxiliary generator to said battery for charging, valve means arranged to connect said source of fuel. to said main prime mover, speed responsive circuit establishing means. arranged. to. deactuate said first circuit establishing means to discern nect said second auxiliary generator from said main generator.- and to reconnect said second auxiliary generator to saidbattery responsive toa predetermined main, prime mover speed, second circuit establishing means arranged to disconnect said; second auxiliary generator from said. battery and toconnect said first auxiliary generator thereto, and. supervisory control means arranged tosequentially actuate said first cir cuit establishing, valve and second. circuit estaw lishing means for starting said. main prime mover, said supervisory control means. being arranged. to deactuate. said operating means after actuation of said second circuit establishing means, to stop said auxiliary prime mover, said supervisory control means being arranged respectively to actuate and; deactuate said operating, second circuit establishing means, valve and first circuit establishing means in. reverse sequence for stopping said, main. primemover.

7.. A system.v starting and shutting down a main thermal prime mover having a main gem crater mechanically connected thereto col, ing auxiliary thermal prime. mover, mechanically connected to drive an. mixiliary generator, 21- source otfuclifor mainrprime-mover, means for starting said auxi lary prime-,moven. first; cir cuit establishing. means arranged. electrically to connect: saida auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, valve means arranged to connect: said. main prime mover to said; source of. fuel, speed responsive circuit establishing means arranged to disconnect said auxiliary generator from said main generator responsive to a predetermined speed of said main prime mover, and supervisory control means arranged sequentially to actuate said first circuit establishing and valve means for starting said main prime mover and to deactuate said lastenumerated means in reverse sequence for shut ting down said main prime mover, said speed responsive circuit establishing means being arranged to reconnect auxiliary generator to said main generator for crankin: said main prime mover when said main prime mover speed falls below a second predetermined value.

8. A system for startin and shutting down a main thermal prime mover having a main. gen erator mechanically connected thereto compris an thermal prime mover mechanically connected to drive an auxiliary generator, a source of fuel for main prime mover, a battery, for starting said auxiliary prime mover, circuit establishing means arranged electrically to connect auxiliary generator to said generator for operating the same as a motor JO cranl: main prime mover, valve means to connect saiu source of fuel to said main priii e mover, a second circuit establishing means arranged electrically to connect auxiliary generator to said battery, first responsive circuit establishing means arranged to deactuate said first circuit establishmeans to disconnect auxiliary generator from said generator and to actuate said seco d circuit establishing means to connect said i cry generator to battery responsive to predetermined speed or said main prime mover, supervisory control means arranged sequentially to actuate said circuit establishing and valve means for star me me er and to tie-actuate main prime mover, said circuit establishing etuate said rcuit esennect said an. genn ator for cool-down main prime mover when said me mover falls belc second predetered lower than st pro-deters ined .ri a second sp c. re five circuit es- 7 c connect said auxi hen supermeal to re ctuate circu estabiisi g ior cool-down cranking but said first speed responsive circuit establish means has not reactuated said firs circuit as 1g means.

i staitin and shutting down a rig a genera- "etc comprising an ver mechanically conary generator, a source mime mover, operating means arrange: w, n actuated to start and run of fuel for sail.

c ry pri.- ..e mover, a circuit establishing device arrange when actuated electr cally to connect aux ary generator to said main generator or operating the as amotor to crank said main prime mover, a valve de ,ce arranged when actuated to connect said source fuel to said a mover, supervisory control means arrange in a first position to actuate said circuit establishing device in a second position to actuate valve device for starting said main prime mover, said supervisory control means being arranged to deactuate said devices in re verse sequene for stopping said main prime mover, first speed responsive means arranged to prevent movement of said supervisory control means to said first position until said auxiliary prime mover reaches a predetermined speed, secend speed responsive means arranged to prevent movement of said supervisory control means to said second position until. said main prime mover reaches a first predetermined speed, and third speed responsive means arranged to deactuate said circuit establishing device to disconnect said auxiliary generator from said he 1 generator responsive to a predetermined second speed of said main prime mover.

10. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of a first type of fuel for said main prime mover, a source of a second type of fuel for said main prime mover, operating means arranged when actuated to start and run said auxiliary prime mover, a circuit establishing device arranged when actuated electrically to connect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, a first valve device arrangement when actuated to connect said source of said first type of fuel to said main prime mover, a second valve device arranged when actuated to connect said source or said second type of fuel to said main prime mover, supervisory control means arranged in a position to actuate said circuit establishing device, in a second position to actuate said first valve means, and in a third position to actuate said second valve means for starting main prime mover, said supervisory control means being arranged to deactuate said devices in re verse sequence for shutting down said main prime mover, first speed, responsive means arranged to prevent movement of said supervisory control means to said first position until. said auxiliary prime mover reaches a predetermined speed, second speed responsive means arranged to prevent movement of said supervisory control means to said third position until said main prime mover reaches a first predetermined speed, and third speed responsive means arranged to deactuate said circuit establishing device to disconnect said auxiliary generator from said main generator responsive to a predetermined second speed of said main prime mover, said third speed responsive means being arranged to prevent movement of said supervisory control means to said third position until said main prime mover reaches said second predetermined speed.

11. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising a first auxiliary generator mechanically connected to said main prime mover, an auxiliary thermal prime mover mechanically connected to drive a second auxiliary generator, a battery, a source of fuel for said main prime mover, an operating device arranged when actuated to start and run said auxiliary prime mover and. when deactuated to stop auxiliary prime mover, a first circuit establishing device arranged when actuated electrically to connect said second auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, a valve device arranged when actuated to connect said source of fuel to said main prime mover, a second circuit establishing device arranged when actuated electrically to connect said second auxiliary generator to said battery for charging, a third circuit establishing device arranged when actuated electrically to connect said first auxiliary generator to said battery for charging; supervisory control means arranged in a first position to actuate said second circuit establishing device, in a second position to deactuate said second circuit establishing device and actuate said first circuit establishing device, in a third position to actuate said valve device, in a fourth position to deactuate said second circuit establishing device and actuate said third circuit establishing device, and in a fifth position to deactuate said starting and running device, said supervisory control means being arranged respectively to deactuate and actuate said devices in reverse sequence for shutting down said main prime mover, first speed responsive means arranged to prevent movement of said supervisory control means to said second position until said auxiliary prime mover reaches a predetermined speed, second speed responsive means ar ranged to prevent movement of said supervisory control means to said third position until said main prime mover reaches a first predetermined speed, and third speed responsive means arranged to deactuate said first circuit establishing device and to actuate said second circuit establishing device responsive to a second predetermined main prime mover speed, said third speed responsive means being arranged to prevent movement of said supervisory control means to said fourth position until said main prime mover reaches said second predetermined speed.

12 A, system for starting and shutting down main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechan ically connected to drive an auxiliary generator, a source of fuel for said main prime mover, operating means connected when energized to start and run said auxiliary prime mover, and a circuit controller having a plurality of contacts, One of contacts connecting said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover in a first predetermined number of positions of said controller, and a second of said contacts connecting said source of fuel to said main prime mover in a second predetermined number of positions of said controller, said first contact disconnecting said auxiliary generator from said main generator in a third predetermined number of positions of said controller.

A system for starting and. shutting orator me: ai call'y connected the etc comprisng an. auxiliary thermal prime mover mechan cally connected. to drive an an? ary generator, a source of fuel. for main. prime mover, op erating conn cted when energized to start and run said auxi "he mover, a circuit establishlng device when energized. to connect generator :or operating the same as a motor to crank. said main prime mover, a valve device ranged when fuel to prime mover, a circuit contro ler having a plurality of contacts for sequentially connecting said. devices for energization to sJart sa d main prime mover "or disconnecting devices in reverse luence for shutting down prime mover, one of said contacts connecting said circuit establishing device for energization in a first predetermined number down a thor 'rl prime mover having main genof positions of said controller and a second or said contacts connecting said valve device for energization in a second predetermined number of positions of said controller, and speed responsive means arranged to de-energize said circuit establishing device responsive to a predetermined speed of said main prime mover.

14. A. system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal pri mover mechanically connected to drive an. auxiliary generator, a source of fuel for said main prime mover, operating means connected when to start and run said auxiliary prime mover, a circuit establishing device arranged. when energ'ted to connect said auxiliary generator to main generator for operating th same as motor to crank said main. prime mover, a valve device arranged when energized. to connect source of fuel to said main prime mover, a circuit controller having a plurality of contacts for sequentially connecting said devices for ener cation to start said main prime mover and for disconnecting said devices in reverse sequence for shutting do'ivn said main. prime mover, one of said contacts connecting said circuit establishing device for energisation in a first predetermined number of positions of said controller and a second of said contacts connecting said valve device for energization in a second predetermined number of positions oi controller, speed responsive means arranged to prevent iovement of said i said main prime mover reaches a first 'ned speed, and third speed responsive means to deactuate said circuit establishing cc to disconnect said auxiliary generator ir-om main generator responsive to a predetermined second speed of said main prime mover.

15. A system for starting shutting main thermal prime mover having a z erator mechanically connected thereto 0 ing an auxiliary thermal. mover n icaliy connected. to an a source of first type of fuel for mover, a source or a second 0L" main prime mover, operating connected When energized to start and run a prime mover, a circuit establishing device arranged wh-en energized to connect said generator to said main generator for operating the same as a motor to crank said main prime mover, a first valve device arranged when energized to connect said source of first type of fuel to said. main prime mover, a second valve device arranged when energized to connect source of said second type of fuel said no .1 prime mover, a circuit controller a p rality of contacts for sequentially connect ng s devices for energization to start sai mover and for disconnecting said verse sequence for shutting down sa ime a third of said contacts connecting said second valve device for energization in a third predetermined number of positions of said controller, and speed responsive means arranged to de-energize said circuit establishing devices responsive to a predetermined speed of said main prime mover.

16. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of first type of fuel for said main prime mover, a source of a second type of fuel for said main prim mover, operating means connected when energized to start and run said auxiliary prime mover, a circuit establishing device arranged when energized to connect said auxiliary generator to said main generator for operating the same as a motor to cranksaid main prime mover, a first valve device arranged when energized to connect said source of said first type of fuel to said main prime mover, a second valve device arranged when energized to connect said source of said second type of fuel to said main prime moved, a circuit controller having a plurality of contacts for sequentially connecting said devices for energization to start said main prime mover and for disconnecting said devices in reverse sequence for shutting down said main prime mover, oneof said contacts connecting said circuit establishing device for energization in a first predetermined number of positions of said controller, a second of said contacts connecting said first valve device for energization in a second predetermined number of positions of said controller, a third of said contacts connecting said second valve device for energization in a third predetermined number of positions of said controller, first speed responsive means furnished to prevent movement of said controller to said first predetermined number of positions until said auxiliary prime mover reaches a predetermined speed, second speed responsive means arranged to prevent movement of said controller into said second predetermined number of positions until said main prime mover reaches a first predetermined speed, and third speed responsiv means arranged to prevent movement of the said controller into said third predetermined number of positions until said prime mover reaches a second predetermined speed, said third speed responsive means being arranged to deactuate said circuit establishing device to disconnect said auxiliary generator from said main generator responsive to said predetermined second speed of said main prime mover.

1'7. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising a first auxiliary generator mechanically connected to said main prime mover, an auxiliary thermal prim mover mechanically connected to drive a second auxiliary generator, a battery, a source of fuel for said main prime mover, an operating device arranged when energized to start and run said auxiliary prime mover and when de-energized to stop said auxiliary prime mover, a first circuit establishing device arranged when energized electrically to connect said second auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, a valv device arranged when energized to connect said source of fuel to said main prime mover, a second circuit establishing device arranged when energized electrically to connect said second auxiliary generator to said battery for charging, a third circuit establishing device arranged when energized electrically to connect said first auxiliary generator to said battery for charging, a circuit controller having a plurality of contacts for sequentially connecting said devices for energization to start said main prime mover and for disconnecting said devices in rea third predetermined number of positions of 20' ing said third circuit establishing device for ensaid controller, a fourth of said contacts connectergization in a fourth predetermined number of positions of said controller, and a fifth of said contacts disconnecting said starting and running device in a fifth predetermined number of position of said controller, and speed responsive means arranged to de-energize said first circuit establishing device responsive to a predetermined speed of said main prime mover.

18. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a

, source of fuel for said main prime mover, a battery, means for starting said auxiliary prime mover, first circuit establishing means arranged electrically to connect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, a valve device arranged when energized to connect said source of fuel to said main prime mover, a second circuit establishing device arranged when energized electrically to connect said auxiliary generator to said battery, a circuit controller having a plurality of contacts for sequentially connecting said devices for energization to start said main .prime mover and for disconnecting said devices in reverse sequence for shutting down said main prime mover, one of said contacts connecting said first circuit establishing device for energization in a first predetermined number of positions of said controller, a second of said contacts cont necting said valve for energization in a second ing device to disconnect said auxiliary generator from said main generator and to energize said second circuit establishing device to connect said auxiliary generator to said battery responsive to a predetermined speed of said main prime mover, said first speed responsive means being arranged to de-energize said first circuit establishing defvice to reconnect said auxiliary generator to said main generator for cool down cranking of said main prime mover when said main prime mover falls below a second predetermined speed lower than said first predetermined speed, and a second speed responsive means arranged to connect said auxiliary generator to said battery when said a source of fuel for said main prime mover, operating means connected when energized to start and run saidauxiliary prime mover, a circuit establishing device arranged when energized to connect said auxiliary generator to said main generator for operating the .same as the motor to crank said main .prime mover, a valve device arranged when energized to connect said source of fuel to said main prime mover, a circuit controller having a plurality .of contacts for se quentially connecting said devices for .energization to start said main prime mover and for disconnecting said devices in reverse sequence for shutting down said main prime .mover, one of said contacts connecting said circuit establishing device for energization in a first predetermined number of positions of said controller and a second of said contacts connecting said valve device for energizationin a second predetermined number of positions of said controller, a latching device arranged when energized to permit said controller to advance one position, first speed responsive meansarranged to energize said latching device responsive to a predetermined speed of said auxiliary prime mover, second speed responsive means arranged to energize said latching device responsive to a first predetermined speed of said main prime mover, and third speed responsive means arranged to de-energize said circuit establishing device to disconnect said auxiliary generator from said main generator responsive to a second predetermined speed of said main prime mover.

20. A. system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanical'ly connected to drive an auxiliary generator, a source of *fuel for said main prime mover, means for starting said auxiliary prime mover, first circuit establishing means arranged electrically to connect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, valve means arranged to connect said main prime mover to said source of fuel, speed responsive circuit establishing means arranged to disconnect said auxiliary generator from said main generator responsive to predetermined speed of said main prime mover, and supervisory control means arranged sequentially to actuate star-ting, first circuit establishing and valve means for starting said main prime mover and to ifleaetuate said last-enumerated means in reverse sequence for shutting down said main prime mover.

21. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of fuel for said main prime mover, operating means connected when energized to start and run said auxiliary prime mover, an operating device connected when errergized to start and run .said auxiliary prime ,mover, va circuit establishing .devic'e arranged when energized to connect said. auxiliary ,generator to ,saidma'in generator for operating the same as the .motor to crank said main prime mover, a valve device arranged when energized to connect said source of fuel to said main prime mover, a circuit controller having a plurality of contacts for sequentially connecting said devices for energization to start said main "prime mover and 'for disconnecting said devices in a reverse sequence for shutting down said main prime mover, one of said contacts connecting said operating device for energiz'ation in a first predetermined number of positions of said controller, a second of said contacts connecting said oncuit establishing device for energization in a second predetermined'number of positions of said controller, and a third of said contacts connecting said valve device for 'energization in a third predetermined number or positions of said controller, and speed responsive means arranged to de-energize said circuit establishing device responsive'to the predetermined speed of said main prime'm'over.

22. A system *for starting and shutting down a main thermal prime mover having 'a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source 'o f fuel "for said main prime mover, means for starting said auxiliary prime mover, first circuit establishing means arranged electrically to connect said #auxiliary generator to said main generator for operating the same as a motor "to crank said main prime mover, valve means arranged to connect said main prime mover to said source of fuel, and speed responsive circuit establishing means arranged to "disconnect said auxiliary generator from said main generator responsive to a predetermined speed to said main prime mover.

23. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of a first type fuel for said main prime mover, a source of second type fuel for said main prime mover, means for starting said auxiliary prime mover, first circuit establishing means arranged electricaliy toconnect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover, first valve means arranged to connect said source of said first'type of fuel to said main prime mover, speed responsive circuit establishing means arranged to disconnect said auxiliary generator from said main generator responsive to a predetermined speed of said main prime mover, and second valve means arranged to connect said source of said second type of fuel to said. main prime mover.

24. A system for starting and "shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising an auxiliary thermal prime mover mechanically connected to drive an auxiliary generator, a source of fuel for said main prime mover, a battery, means for starting said auxiliary prime mover, first circuit establishing Imeans arranged when actuated so electrically connect said auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover and when deactuate'd to connect said auxiliary generator to said battery for charging, valve means arranged to connect said source of fuel to said main prime mover, and speed responsive circuit establishing means arranged to deactuate said first circuit establishing means to disconnect said auxiliary generator from said main generator and to reconnect said auxiliary generator to said battery responsive to a predetermined speed of said main prime mover.

25. A system for starting and shutting down a main thermal prime mover having a main generator mechanically connected thereto comprising a first auxiliary generator mechanically connected to said main prime mover, an auxiliary thermal prime mover mechanically connected to drive a second auxiliary generator, a battery, a source of fuel for said main prime mover, operating means arranged when actuated to start and run said auxiliary prime mover and when deactuated to stop the same, first circuit establishing means arranged when actuated to electrically connect said second auxiliary generator to said main generator for operating the same as a motor to crank said main prime mover and when deactuated to connect said second aux- CARL A. BRANCKE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,159,521 Heany May 18, 1915 1,356,065 Heinze Oct. 19, 1920 1,409,736 Lea Mar. 14, 1922 2,298,309 Ray Oct. 13, 1942 2,405,676 Strub Aug. 13, 1946 2,503,289 Nettel Apr. 11, 1950 2,624,849 Bennett-Powell Jan. 6, 1953 

